package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl  extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;
    /**
     * 根据id删除分类，删除之前需要进行判断有无关联菜品套餐
     * @param id
     */
    @Override
    public void remove(Long id) {
//        查询当前分类是否关联了菜品，如果已经关联，抛出一个业务异常
        LambdaQueryWrapper<Dish> qw = new LambdaQueryWrapper<>();
        qw.eq(Dish::getCategoryId,id);
        int count = dishService.count(qw);
        if(count>0){
//            抛出一个业务异常
            throw new CustomException("当前分类下关联了菜品，不能删除");
        }
//        查询当前分类是否关联了套餐，如果已经关联，抛出一个业务异常
        LambdaQueryWrapper<Setmeal> qwSet = new LambdaQueryWrapper<>();
        qwSet.eq(Setmeal::getCategoryId,id);
        int countSet = setmealService.count(qwSet);
        if(countSet>0){
//            抛出一个业务异常
            throw new CustomException("当前分类下关联了套餐，不能删除");
        }
//        正常删除分类
        super.removeById(id);
    }
}
